A High-Efficiency Li-ion Battery Switching Charger with Dual-Path Three-Level Buck Converter
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초록
This paper proposes a Li-ion battery switching charger with a three-level DC-DC buck converter adopting a loop-free auto-calibration technique for self-balancing of two flying capacitors. The proposed Li-ion battery switching charger provides four operation modes including trickle, pre-charge, constant current (CC) and constant voltage (CV) mode as the Li-ion battery voltage level. It is designed by 0.13-μm CMOS BCD process and used 0805 size two flying capacitors of 4.7 μF each and an inductor of 10 μH with a DC resistance (DCR) of 100 mΩ as output components. The core chip size without pads is 3.7 × 3.7 mm2. The measurement verified the proposed loop-free auto-calibration scheme and the simulation result shows charging process. The supply voltage is 9 V and the load voltage condition varies 2.7-4.2 V and the maximum load current is 1.5 A. The simulation peak efficiency of constant current mode is 93.2% at 1 MHz switching.
Abstract
This paper proposes a Li-ion battery switching charger with a three-level DC-DC buck converter adopting a loop-free auto-calibration technique for self-balancing of two flying capacitors. The proposed Li-ion battery switching charger provides four operation modes including trickle, pre-charge, constant current (CC) and constant voltage (CV) mode as the Li-ion battery voltage level. It is designed by 0.13-μm CMOS BCD process and used 0805 size two flying capacitors of 4.7 μF each and an inductor of 10 μH with a DC resistance (DCR) of 100 mΩ as output components. The core chip size without pads is 3.7 × 3.7 mm2. The measurement verified the proposed loop-free auto-calibration scheme and the simulation result shows charging process. The supply voltage is 9 V and the load voltage condition varies 2.7-4.2 V and the maximum load current is 1.5 A. The simulation peak efficiency of constant current mode is 93.2% at 1 MHz switching.
참고문헌 (12)
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